Escherichia coli (small Gram negative rod)

x 160

x 400

x1000 (oil immersion)

Bacillus subtilis (large Gram positive/variable rod)

x 160

x 400

x1000 (oil immersion)

 Micrococcus luteus (Gram positive coccus)

x 160

x 400

x1000 (oil immersion)

  

x 160 (appearance when smear is too thick)